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"tremor" is also used as a crossword clue. If that's what you saw, the answer is often vibration (9 letters).
Definitions
an involuntary vibration (as if from illness or fear)
Word origin
From Middle English tremour (“fright”), from Anglo-Norman tremour and Old French tremor, from Latin tremor.
Used in a sentence
“She felt a tremor in her stomach before going on stage.”
“The optometrist has been losing patients ever since he developed tremors in his hand.”
“Did you feel the tremor this morning?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Slight shaking”6 letters
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